Earlier Tuesday, Clinton and Trump both held rallies in Florida as they work to lockup votes ahead of the Nov. 8 election.

Kellyanne Conway, Trump's campaign manager, referenced Clinton's appearance at the concert while defending the GOP nominee's decision to appear at the opening of his new hotel in Washington, D.C., on Wednesday.

"Respectfully, Hillary Clinton has time to go to an Adele concert and everyone thinks that's really cool," she told NBC's "Today" show Wednesday. "Donald Trump stops off to unveil just an incredible, stunning piece of architecture, a new first class hotel and everyone's hair is on fire. I think you see today tangible accomplishments of Donald Trump."